https://sourceforge.net/p/gphoto/patches/150/ From:  Yifan Lu 
https://sourceforge.net/p/gphoto/patches/150/
From:  Yifan Lu 

better ptpip event checking support.


git-svn-id: 40dd595c6684d839db675001a64203a1457e7319@14417 67ed7778-7388-44ab-90cf-0a291f65f57c

gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION